If any program can recover audio loops from .rex files and save them back as .rx2, it would be ReCycle software from both of these files originate. However, sadly we could not find a specific information regarding REX to RX2 conversion.
Convert ReCycle audio loop export file to ReCycle! audio loop file.
We found 2 software records in the database related to .rex to .rx2 file format conversion.
Microsoft Windows software - convert rex to rx2 on Windows
Program for fast editing of sampled parts, chopping up riffs, remixing and doing mash ups
Convert from rex file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned rex to rx2. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Multiplatform software - convert rex to rx2 on any platform
A professional instrument conversion program